*{
    margin: 0;
    padding: 0;
}
body{
    background-color: rgb(255,253,243);
}
.header{
    width: 100%;
    height: 50px;
    background:white;
    border-bottom: 1px solid #454545;
}
.header>h1{
    text-align: center;
}
.content{
    width: 100%;
    height: 500px;

    padding-left: 20px;
    padding-right: 20px;
}
.content .dropMenu{
    width: 10%;
    height: 500px;
    float: left;
    cursor: pointer;
}
.dingWei{
    margin-top: 30px;
}
.dingWei>li{
    list-style-type: none;
    border-bottom: 1px solid white;
    text-indent: 3em;
    line-height: 30px;
    background: #282828;
    color: white;
    opacity: 80%;
}
 .dingwei-wap{
     display: none;
 }
 .dingWei .dingwei-wap>li{
    list-style-type: none;
    border-bottom: 1px solid white;
    background: #282828;
    opacity: 20%;
    color: white;
}

.tab{
    margin-left: 3px;
    width: 1200px;
    height: 30px;
    margin-top: 0px;
    padding-left: 10px;
    background: #282828;
    float: left;
    opacity: 0.8;
}
.tab> .tabmenu{
    list-style-type: none;
    border-bottom: 1px solid white;
}
.tabmenu >li{
    display: inline-block;
    width: 100px;
    text-align: center;
    line-height: 30px;
    float: left;
    color: white;
    border: 1px solid white;
    border-right: none;
    opacity: 0.5;
}
.tabmenu>li:last-child{
    border-right: 1px solid white;
}

.selected{
    opacity: 1;
    border-bottom: 2px solid blueviolet;
}
.footer{
    width: 100%;
    height: 100px;
    background: black;
    position: absolute;
    left: 0;
    bottom: 0;
}
.border{
    border: 1px solid black;
}
.bordertable{
    border-collapse: collapse;
    margin-left: 300px;
}
.class-title{
    width: 1200px;
    margin: 0 auto;
    display: flex;
    /* justify-content: space-around; */
    cursor: pointer;
}
.class-title div{
    
    margin-left: 20px;
   
}
.span-in{
    position: absolute;
    display: block;
    right: -8px;
    top: -8px;
    width: 15px;
    height: 15px;
    line-height: 15px;
    text-align: center;
    background-color: #FF00FF;
    font-size: 10px;
    color: white;
    border-radius: 50%;
}
